Precipitation behavior and mechanical properties of Mg-Nd-Sm-Zn-Zr alloy

Zhang, Chaosheng; Zhao, Sicong; Li, Jingfang; Feng, Yicheng; Wang, Lei; Wang, Zhiwei; Guo, Erjun

doi:10.1016/j.jmrt.2023.12.276

Cited by 2 publications

(1 citation statement)

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“…It could be caused by grain refinement and the increase of the multiple strengthing phases. For the previously reported heat-treated Mg-RE alloys [45][46][47][48], their strengthening phases are mainly metastable β″, β′, and β1 series precipitates, which are less stable at high temperatures than the β phase. Compared to as-cast Mg-RE alloys, the high-temperature strength of these heattreated alloys is more likely to decline in long-term service at high-temperature conditions.…”

Section: Tensile Propertiesmentioning

confidence: 92%

Tailoring Multiple Strengthening Phases to Achieve Superior High-Temperature Strength in Cast Mg-RE-Ag Alloys

Zhao,

Guo,

Liu

et al. 2024

Materials

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Mg alloys with excellent high-temperature mechanical properties are urgently desired to meet the design requirements of new-generation aircraft. Herein, novel cast Mg-10Gd-2Y-0.4Zn-0.2Ca-0.5Zr-xAg alloys were designed and prepared according to the advantages of multi-component alloying. The SEM and XRD results revealed that the as-cast microstructures contained α-Mg grains, β, and Zr-containing phase. As Ag rose from 0 wt.% to 2.0 wt.%, the grain size was refined from 40.7 μm to 33.5 μm, and the β phase significantly increased. The TEM observations revealed that the nano-scaled γ′ phase could be induced to precipitate in the α-Mg matrix by the addition of Ag. The stacking sequence of lamellar γ′ phases is ABCA. The multiple strengthening phases, including β phase, γ′ phases, and Zr-containing particles, were effectively tailored through alloying and synergistically enhanced the mechanical properties. The ultimate tensile strength increased from 154.0 ± 3.5 MPa to 231.0 ± 4.0 MPa at 548 K when Ag was added from 0 to 2.0 wt.%. Compared to the Ag-free alloy, the as-cast alloy containing 2.0 wt.% Ag exhibited a minor reduction in ultimate tensile strength (7.0 ± 4.0 MPa) from 498 K to 548 K. The excellent high-temperature performance of the newly developed Mg-RE-Ag alloy has great value in promoting the use of Mg alloys in aviation industries.

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Section: Tensile Propertiesmentioning

confidence: 92%